Forms a low-growing, cushion-like mat covered in pure white flowers in mid-to-late spring. This evergreen perennial is ideal for rock gardens, slopes, and borders, and it prefers full sun, well-drained, and slightly alkaline soil. It is drought-tolerant once established and can be maintained by pruning after blooming. Grows to a mature height of about 4 to 6 inches, spreads to a width of 18 to 24 inches.